Maximum PC: Western Digital today announced the expansion of its WD Red line of SATA hard drives built specifically for home and small office NAS (network attached storage) systems with one to five bays. Previously only offered in the 3.5-inch form factor, Western Digital is now offering 1TB and 750GB WD Red drives in the 2.5-inch form factor as well. In addition, the company stretched its 3.5-inch line to 4TB.
Western Digital My Book Duo offers a massive storage solution, you can use it either for backup drive or even as a NAS storage.